A volume coil for a magnetic resonance (MR) tomography apparatus has a number of array coils or coil parts arranged on at least one coil carrier. The coil carrier annularly encloses or the coil carriers annularly encloses or enclose a cross-sectional area that can be varied by modifying the position of the coil carriers or parts thereof relative to one another.

 
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> Method for localized excitation for accurate center frequency measurements with MRI

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